BIOL 2003 Lecture 1: Biol 2003 lecture notes midterm 1
10 Dec 2015
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Extremely diverse (85,000+ species) and disparate (8 classes), its hard to believe that an octopus and a snail are in the same phylum. Second to the arthropods they are the most specious phylum. Food: calamari, escargot, mussels, scallops, clams the global catch is a hundreds of millions of tonnes per year. Pearls and shells: cowries = currency, pearls come from bivalve molluscs not just. Oysters and not just pearls many countries like africa use cowry shells called cowries as a form of currency. Bio-indicators: environmental indicators and filters, blue mussels can examine costal waters as indicators, as can the zebra mussel in the great lakes which is also an invasive species, but can be used for our advantage. It"s a chitinous ribbon of teeth (not a tongue) that moves over an odontophore cartilage and the odontophore can move in and out so it moves over its moves.
